Montmorillonite-Vermiculite Group; Beidellite-Montmorillonite Series. A common clay mineral. Compare 'UM1979-21-SiO:AlHNaV'. As halloysite, it may be a biomineral formed by the action of lichens (e.g., Lasallia spp., Parmelia spp., etc.) on cave deposits and waters (vide Burford et …

Other articles where Smectite is discussed: bentonite: …clay minerals belonging to the smectite group, which are hydrous aluminum silicates containing iron and magnesium as well as either sodium or calcium.

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